I'm not seeing any identifiable pattern, although I don't understand why there are so many background queries. They're not coming from my router though - I've got the pi-hole passing out ip's, so most of the traffic I'm seeing comes from my computers, with a few queries from my smart home devices.
edit: Ok, the largest number is coming from an LG device, but not my TV. To the best of my knowledge, there are only 3 LG devices in the house, which means either the laundry machine or dryer is putting out a ton of queries (750,000)
edit 2: More the fool I: That LG device is actually my phone.
Sorted by number of queries: